Rename attribute 'thumb' to a more descriptive 'thumb-mode'.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134626 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMSubtarget.cpp b/lib/Target/ARM/ARMSubtarget.cpp
index 1905985..506fe80 100644
--- a/lib/Target/ARM/ARMSubtarget.cpp
+++ b/lib/Target/ARM/ARMSubtarget.cpp
@@ -53,7 +53,7 @@
   , SlowFPVMLx(false)
   , HasVMLxForwarding(false)
   , SlowFPBrcc(false)
-  , IsThumb(false)
+  , InThumbMode(false)
   , HasThumb2(false)
   , NoARM(false)
   , PostRAScheduler(false)